POSITION INFORMATION DETECTION DEVICE, POSITION INFORMATION DETECTION METHOD, AND POSITION INFORMATION DETECTION PROGRAM
First Claim
1. A position information detection device, comprising:
- an image capture portion which captures images, via a camera lens, of discrimination marks arranged on the side of an indication target plane;
a discrimination mark extraction portion which extracts geometric figures from images captured by said image capture portion;
a reference rectangle extraction portion which extracts a reference rectangle image formed by connecting specific points in said geometric figures;
a focal length calculation portion which, based on a coordinate system specified by said reference rectangle image, calculates the focal length of the camera lens of said image capture portion with respect to said indication target plane; and
an indicated position calculation portion which, based on said coordinate system and said focal length, calculates an indicated position of said image capture portion with respect to said indication target plane.
1 Assignment
0 Petitions
Accused Products
Abstract
A position information detection device, method, and program are provided, which are capable of detecting position information with high precision using simple and easily identified discrimination marks. A position information detection device has an image capture portion 203 which captures images of discrimination marks 102 arranged on a display 103, via a camera lens; a discrimination mark extraction portion 206 which extracts geometric figures from images captured by the image capture portion 203; a reference rectangle extraction portion 207 which extracts a reference rectangle image formed by connecting specific points in the geometric figures; a focal length calculation portion 213 which, based on a coordinate system specified by the reference rectangle image, calculates the focal length of the camera lens of the image capture portion 203 relative to the image display region of the display 103; and an indicated position calculation portion 210 which, based on the coordinate system and the focal length, calculates the indicated position of the image capture portion 203 relative to the image display region.
-
Citations
21 Claims
-
1. A position information detection device, comprising:
-
an image capture portion which captures images, via a camera lens, of discrimination marks arranged on the side of an indication target plane; a discrimination mark extraction portion which extracts geometric figures from images captured by said image capture portion; a reference rectangle extraction portion which extracts a reference rectangle image formed by connecting specific points in said geometric figures; a focal length calculation portion which, based on a coordinate system specified by said reference rectangle image, calculates the focal length of the camera lens of said image capture portion with respect to said indication target plane; and an indicated position calculation portion which, based on said coordinate system and said focal length, calculates an indicated position of said image capture portion with respect to said indication target plane. - View Dependent Claims (5, 6, 7, 8, 9, 10, 19)
-
-
2. A position information detection device, comprising:
-
an image capture portion which captures images, via a camera lens, of discrimination marks arranged on the side of an indication target plane; a discrimination mark extraction portion which extracts geometric figures from images captured by said image capture portion; a reference rectangle extraction portion which extracts a reference rectangle image formed by connecting specific points in said geometric figures; a reference rectangle storage portion which stores the reference rectangle image extracted by said reference rectangle extraction portion; a focal length calculation portion which, based on a coordinate system specified by said reference rectangle image, calculates the focal length of the camera lens of said image capture portion with respect to said indication target plane; an indicated position calculation portion which, based on said coordinate system and said focal length, calculates an indicated position of said image capture portion with respect to said indication target plane; and a reference rectangle inference portion which, when discrimination marks cannot be extracted by said discrimination mark extraction portion, infers a reference rectangle image based on the reference rectangle image stored in said reference rectangle storage portion. - View Dependent Claims (3, 4, 15, 16, 17, 18, 20, 21)
-
-
11. A position information detection method, comprising the steps of:
-
capturing an image, via a camera lens, of discrimination marks arranged on the side of an indication target plane by means of an image capture portion; extracting geometric figures from the image captured by the image capture portion, by means of a discrimination mark extraction portion; extracting a reference rectangle image formed by connecting specific points in said geometric figures, by means of an reference rectangle extraction portion; calculating the focal length of the camera lens of said image capture portion with respect to said indication target plane, based on a coordinate system specified by said reference rectangle image, by means of a focal length calculation portion; and calculating an indicated position of said image capture portion with respect to said indication target plane, based on said coordinate system and said focal length, by means of an indicated position calculation portion.
-
-
12. A position information detection method, comprising the steps of:
-
capturing an image, via a camera lens, of discrimination marks arranged on the side of an indication target plane by means of an image capture portion; extracting geometric figures from the image captured by the image capture portion, by means of a discrimination mark extraction portion; extracting a reference rectangle image formed by connecting specific points in said geometric figures, by means of an reference rectangle extraction portion; storing the reference rectangle extracted by said reference rectangle extraction portion, by means of a reference rectangle storage portion; calculating the focal length of the camera lens of said image capture portion with respect to said indication target plane, based on a coordinate system specified by said reference rectangle image, by means of a focal length calculation portion; calculating an indicated position of said image capture portion with respect to said indication target plane, based on said coordinate system and said focal length, by means of an indicated position calculation portion; and inferring, by means of a reference rectangle inference portion, the reference rectangle image based on the reference rectangle image stored in said reference rectangle storage portion when the discrimination mark extraction portion cannot extract discrimination marks.
-
-
13. A position information detection program, executable by a computer connected to an image capture portion, characterized by causing:
-
capture of an image, via a camera lens, of discrimination marks arranged on the side of an indication target plane by means of the image capture portion; extraction of geometric figures from the image captured by the image capture portion; extraction of a reference rectangle image formed by connecting specific points in said geometric figures;
calculation of the focal length of the camera lens of said image capture portion with respect to said indication target plane, based on a coordinate system specified by said reference rectangle image; andcalculation of an indicated position of said image capture portion with respect to said indication target plane, based on said coordinate system and said focal length.
-
-
14. A position information detection program, executable by a computer connected to an image capture portion, characterized by causing:
-
capture of an image, via a camera lens, of discrimination marks arranged on the side of an indication target plane by means of the image capture portion; extraction of geometric figures from the image captured by the image capture portion; extraction of a reference rectangle image formed by connecting specific points in said geometric figures;
storage of said reference rectangle image;
calculation of the focal length of the camera lens of said image capture portion with respect to said indication target plane, based on a coordinate system specified by said reference rectangle image;calculation of an indicated position of said image capture portion with respect to said indication target plane, based on said coordinate system and said focal length; and inference of the reference rectangle image based on the stored reference rectangle image when discrimination marks cannot be extracted.
-
Specification